feat(editor): implement SimpleEngine which doesn't use intelligent ph…

[kanru]

…rasing

Fixes #556, Fixes #9

[codecov]

Codecov Report

Attention: Patch coverage is 81.70732% with 15 lines in your changes missing coverage. Please review.

Project coverage is 89.45%. Comparing base (5e0cf21) to head (e92a4a8).

Files	Patch %	Lines
capi/src/io.rs	53.33%	7 Missing ⚠️
src/conversion/chewing.rs	86.79%	7 Missing ⚠️
src/editor/mod.rs	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #604      +/-   ##
==========================================
- Coverage   89.52%   89.45%   -0.08%     
==========================================
  Files          39       39              
  Lines        8508     8580      +72     
==========================================
+ Hits         7617     7675      +58     
- Misses        891      905      +14     

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